Steam-engine valve



(No Model.)

E. O. KNAPP. STEAM ENGINE VALVE.

Patented May 26, 1896,

W] TNESSES;

INVENTd/f. 5 M

UNITED STATES PATENT OFFICE.

EDWIN O. KNAPP, OF BOUlND BROOK, NEW JERSEY.

STEAM-ENGINE VALVE.

SPECIFICATION forming part of Letters Patent No. 560,803, dated May 26,1896.

Application filed July 2, 1896. Serial No. 554,774. (No model.)

To aZZ whom it may concern:

Be it known that I, EDWIN O. KNAPP, a citizen of the United States,residing at Bound Brook, in the county of Middlesex and State of NewJersey, have invented a new and useful Improvement in Steam-EngineValves, of which the following isa specification. I

My invention is an improvement in that style of cylindrical valve whichhas both a reciprocating motion in the direction of its axis and also anoscillating motion about that axis. Its object is to increase the areaof the ports or steam-passages, allowing a freer flow of steam to thecylinder, and also by increasing the cutting edge thus obtain a sharpercutoff. I obtain these results by means of a novel arrangement ofports,which,with their method of working, are shown in the accompanyingdrawings, in which-- Figure 1 is a plan of a cylinder and valvechestcontaining the valve. Fig. 2 is a vertical section through thecylinder,valve-chest, and valve upon the line a b, Fig. 1. Fig. 3 is aplan of the valve alone. Fig. 1 is a part elevation and a part sectionon the line 0 d, Fig. 3. Fig. 5 is a section of the valve and seat onthe line e f, Fig. 4:.

Similar figures refer to similar parts throu ghout the views.

Fig. 1 shows the valve, which has a cylindrical face 35, in which arelongitudinal ports 1 2 3, whose sides may be radial or parallel and maybe cut at intervals wholly or partly around the circumference, asdesired. In the ends of the valve are chambers 37 and 38, to which thealternate longitudinal ports in the valve-face lead, ports 1 3 5 7 (oddnumbers) leading to chamber 37 and ports 2 4 6 8 (even numbers) leadingto chamber 38. Chambers 37 and 38 are connected with the head and crankends of the cylinder, respectively, through the valve-ports 39 and 4:0and the cylinder-ports 4:1 and 42 by the reciprocating longitudinalmotion of the valve, while outoff is effected by the longitudinal portsin the valve and valve-seat, as follows: Fig. 5 shows a section of thevalve and seat in which the valve is at mid-travel as regards itsoscillating motion about its axis, and the ports lead ing to chamber 37appear in full lines, while those leading to chamber 38 are dotted.Surrounding the valve is the seat 36, in which are the ports 21 22 2330, opening to the steamchest, which surrounds the seat. Upon each sideof a longitudinal port in the seat, as 21, is one of a pair of ports inthe valve, as 1 and 2, leading to the opposite chambers 37 and 38. Eachof this pair of ports, as 1 and 2, are opened alternately into the portin the seat, as 21, by the oscillating motion, thus alternatelyadmitting and cutting oft steam from the chambers 37 and 38. It will beseen that any two alternate ports in the valve, as 12 and 13, overlapeach other in a longitudinal direction by same distance g h, thus givinga longer port, and consequently more area and a sharper cut-off. Thisoverlapping of ports is the feature which I claim as my invention.

Having thus fully described my invention, What I desire to claim andsecure by Letters Patent is- A valve having a cylindrical face, 35, cupshaped chambers, 37 and 38, openinginto ports 39 and 10 at oppositeends, and longitudinal ports, 1, 2, 3, 4, alternate ports overlappingone another near the middle of the length of the valve-face, 35, andopening into the opposite chambers, 37 and 38, substantially as and forthe purpose described.

' EDWIN O. KNAPP.

Witnesses:

CHAS. A. PIERCE, BENJ. F. CoDNER.

